Tristychius
| Tristychius Temporal range: Early Carboniferous
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| Genus: | Tristyichius
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Tristychius is an extinct genus of shark from the Carboniferous era.
It was a small shark with a well-developed caudal fin that was aimed upwards, similar to that of many modern sharks. Physically it may have resembled a cat shark. Tristychius also had spikes attached to the bases of its dorsal fins, probably for protection against predators. It was related to the larger Hybodus.
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